Ohio Gov. John Kasich refused to say whether presidential nominee rival Donald Trump was fit to be president a day after criticizing the party's frontrunner over recent violence at his rallies.

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"You’re not going to get me to answer a yes-or-no question," Kasich said. "I hope he’s going to change his rhetoric and bring people together."

Kasich criticized Trump on Saturday for creating a "toxic environment" that has led to violence at some of his rallies. He had previously pledged to support Trump if the real estate mogul were to win the nomination, but said Sunday that "nothing's 100 percent."